Methodology Presentation October 13, 2016 Traditional Methodology - - PowerPoint PPT Presentation

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Methodology Presentation October 13, 2016 Traditional Methodology - - PowerPoint PPT Presentation

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San Francisco Sewer Inspection Methodology Presentation October 13, 2016 Traditional Methodology 1. Pan & Tilt Camera 2. Panoramo 360 Camera (Est. Starting 2010) 3. Walking Inspection (For Larger Structures) Pan & Tilt Camera

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San Francisco Sewer Inspection Methodology Presentation

October 13, 2016

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“Traditional” Methodology

  • 1. Pan & Tilt Camera
  • 2. Panoramo 360 Camera (Est. Starting

2010)

  • 3. Walking Inspection (For Larger

Structures)

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Pan & Tilt Camera (Sample)

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Pan & Tilt Video

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Panoramo 360 Camera (Sample)

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Panoramo 360 Inspection Video

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Pan & Tilt Camera

Advantage

  • More Sturdy Than Panoramo 360

Disadvantage

  • Inspection Limited to What Camera Points To
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Panoramo 360 Camera

Advantage

  • Reviewer Has Control During Video Review

Disadvantages

  • Higher Sensitive To “Bumps” (Can Lead To Missed Images)
  • Poorer Maneuverability (Esp. Thru Curves and Obstructions)
  • Not As Good For Observing Certain Types of Infiltration
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Latest Equipment Acquisition: Electro Scan (For Detection of “Leaks” in Sewer Due to Openings)

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Electro Scan Truck Model ES-620

(Photo taken from the website www.electroscan.com)

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Electro Scan Summary Schematic

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Electro Scan Demo

San Francisco, CA September 15 & 16, 2015

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Demo Locations

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Site 1 – The Embarcadero & Brannan (East Side of Intersection By Brannan Outfall)

Sewers Inspected During Demo

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Site 1 (The Embarcadero & Brannan) – Upstream

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Site 1 (The Embarcadero & Brannan) – Downstream

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Electro Scan Demo Truck On Location

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Known Leaking Joint At 12-Inch Sewer

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Electro Scan Probe

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Cone For Directing Nozzle Spray

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Lowering Of Probe (Connected to Jetting Nozzle) Into Upstream MH

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Vactor Truck Setup at Downstream MH (For Jetting Nozzle To Pull Probe)

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Electro Scan Report (Page 1 For Segment 1)

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Electro Scan Report (Page 1 For Segment 2)

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Data Uploaded To Cloud Server

Assessed Via Critical Sewers

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Follow Up With CCTV To View Cause of Electro Scan Defects (If Necessary)

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Electro Scan Features Summary

  • Can scan pipes up to 30” in diameter
  • Probe emits 10 volts, 40 milliamps (Equivalent

to 6 AA batteries)

  • Assumes 1’ of head above pipe (for volume

calculations)

  • Can scan through grease and roots
  • Can be used during wet weather
  • No operator error
  • Scans upload to cloud within minutes of

completion

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Electro Scan “Defects” Definition

Defects

  • Small 100-400 µA
  • Medium 400-700 µA
  • Large 700+ µA

Infiltration is the defect current x the defect length

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Electro Scan Used For TDML Locations:

1. Candlestick Point 2. Crissy Field 3. Aquatic Park Sewers sized 15 inches in diameter as less assigned

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Other Inspection Methodologies

  • 1. Pole Cam
  • 2. Sonar (By Contractor)
  • 3. Laser (By Contractor)
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SFPUC “Repair vs. Replacement” Decision Process

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Decision Matrix Developed For Electro Scan Findings

SALTWATER INTRUSION SEWER REPAIR DECISION CHART Last Revised September 23, 2016 REPAIR RECOMMENDATION Brick Sewers Replacement (per recent internal proposal) Manhole Manhole Point Repair Non-Circular Sewers Manual Grouting Significant "Grade 5" Defects (XP, D, BSV, BVV, HSV, HVV, B or H (2 positions or more), FH4, FH3, CH4, CH3) Any Type of Pipe Refer to "Repair Vs. Replacement Decision Flowchart" Break-In and Intuding Lateral Refer to "Repair Vs. Replacement Decision Flowchart" Other Lateral Types Point Repair Concrete Pipes > 24" Diameter (Any Number of Defective Joints) Automated Grouting Less Than 25 % of Joint On Block Defective Automated Grouting Greater Than 25% of Joints On Block Defective Pipe Lining Less Than 25% of Block Having Defects Sectional Point Repair Greater Than 25% of Block Having Defects Pipe Lining Manhole Defects Any Type Causing Infiltration Manhole Point Repair *Note: Prior to assigning repair, research should be performed as to whether sewer assets are on blocks scheduled for projects such as paving, streetscahpe, or others which may result in additional DEFECT TYPE / DESCRIPTION Defect at Lateral Defective Joint With No Other Main Sewer Defect Involved Other Main Sewer Defects (Cracks, Fractures, Small Breaks and Holes) Any Type of defects

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Contractors Used By SFPUC Wastewater Enterprise

National Plant Services Contact: Michelle Beason Phone: 925-262-7366 E-Mail: mbeason@nationplant.com Pipe and Plant Service Contact: Bill Gilmartin Phone: 888-978-8264 E-Mail: bgilmartin@pipeandplant.com Professional Pipe Services (ProPipe) Contact: Jason Walborn Phone: 800-784-7473 E-Mail: jwalborn@hswcorp.com

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The End